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MIAMI INTERNATIONAL HOLDINGS, INC. director Jill E. Sommers filed an initial ownership report showing vested stock option holdings in MIAX common stock. The filing lists three nonqualified stock option awards, each giving the right to buy shares at fixed exercise prices before specified expiration dates.
One option covers 2,709 underlying common shares at an exercise price of $20.60 per share, expiring on December 28, 2033. A second option covers 8,792 underlying shares at $20.00 per share, expiring on March 31, 2034. A third option covers 8,306 underlying shares at $22.34 per share, expiring on March 4, 2035. A footnote states that all of these options are fully vested.
Miami International Holdings, Inc. reported board changes tied to its 2026 Annual Meeting. On March 24, 2026, director Lee Becker informed the board that he will not stand for reelection, and will continue serving until his current term ends at the Annual Meeting.
Also on March 24, 2026, upon recommendation of its Nominating and Corporate Governance Committee, the board elected Jill E. Sommers as a director effective March 25, 2026, to serve until the 2026 Annual Meeting or until a successor is elected and qualified. She has no disclosed related-party transactions or family relationships with directors or executives and will be compensated like other non-employee directors.
MIAMI INTERNATIONAL HOLDINGS, INC. director Judson Gray Teekell reported an open-market sale of 300 shares of common stock at $40.00 per share on March 25, 2026. The transaction was executed as a non-derivative sale.
Following this sale, Teekell directly holds 62,038 shares of the company’s common stock. According to the footnotes, the trade was carried out under a previously established Rule 10b5-1 trading plan adopted on December 17, 2025 and was executed in multiple trades at a weighted average price of $40.00.
MIAMI INTERNATIONAL HOLDINGS, INC. executive Shelly Brown, EVP and Chief Strategy Officer, sold 25,932 shares of common stock in an open-market transaction at a weighted average price of $39.33 per share. The shares were sold under a previously established Rule 10b5-1 trading plan adopted on December 22, 2025, indicating the sales were pre-scheduled. Following the transaction, Brown directly holds 299,197 shares. The trade was executed in multiple transactions during the day, at prices ranging from $38.98 to $39.80 per share.
MIAMI INTERNATIONAL HOLDINGS, INC. director Kurt M. Eckert exercised stock options for 12,917 shares of common stock at $12.00 per share and then sold 37,917 shares in the open market. The sales were made at a weighted average price of $39.00 per share, with individual trades ranging from $38.62 to $39.48. These transactions were carried out under a previously established Rule 10b5-1 trading plan adopted on December 18, 2025, indicating they were pre-planned rather than discretionary. Following the transactions, Eckert directly holds 142,375 shares of common stock, and the exercised options are fully vested with no remaining derivative position reported.
MIAX filed a Form 144 notice to sell 48,792 shares of common stock.
The filing lists 23,792 shares from an exercise of stock options dated 03/19/2026 (method: cash) and 25,000 shares from restricted stock awards dated 02/01/2026
MIAMI INTERNATIONAL HOLDINGS EVP and CIO Douglas M. Schafer Jr. exercised stock options and sold shares in a planned transaction. He exercised 48,000 Nonqualified Stock Options at $12.00 per share, receiving 48,000 shares of common stock. The same day, he sold 48,000 common shares at a weighted average price of $39.74 per share in open‑market trades made under a previously established Rule 10b5‑1 trading plan. After these transactions, he directly owns 396,681 common shares. The options exercised were fully vested, and no remaining derivative positions are shown in this filing.